The 43/64 X 18 SS HS XL Drill from Field Tool Supply is a high-speed steel drill bit designed for heavy-duty applications. With a diameter of 43/64 inches and 18 threads per inch (TPI), it is ideal for drilling through stainless steel and other tough materials. This extra-long drill bit provides extended reach and versatility, making it suitable for various machining tasks. Its durable construction ensures longevity and reliable performance, meeting industry standards for quality. This drill bit is perfect for both professional machinists and DIY enthusiasts.